firmness vs flippancy

firmness

noun
  • security; steadfastness; good grip 

  • strictness; mental strength 

  • physical durability; rigidness (of material) 

flippancy

noun
  • A disrespectful levity or pertness especially in respect to grave or sacred matters. 

How often have the words firmness and flippancy occurred in a corpus of books? (source: Google Ngram Viewer )